The Phillies placed Rucker on the 15-day injured list Thursday with a right hand arterial vasospasm.
Rucker hasn't made a Grapefruit League appearance since March 1 due to numbness in his right middle finger, Todd Zolecki of MLB.com reports.
The Phillies acquired Rucker from the Cubs on Tuesday in exchange for cash considerations.
Rucker was designated for assignment by the Cubs on Thursday, Bruce Levine of 670TheScore.com reports.
The Cubs optioned Rucker to Triple-A Iowa on Thursday, Meghan Montemurro of the Chicago Tribune reports.
The Cubs recalled Rucker from Triple-A Iowa on Tuesday, Meghan Montemurro of the Chicago Tribune reports.
The Cubs optioned Rucker to Triple-A Iowa on Friday, Meghan Montemurro of the Chicago Tribune reports.
The Cubs recalled Rucker from Triple-A Iowa on Wednesday, Taylor McGregor of Marquee Sports Network reports.
The Cubs optioned Rucker to Triple-A Iowa on Tuesday, Tony Andracki of Marquee Sports Network reports.
Rucker (1-1) allowed a run on two hits without retiring a batter to take the loss Friday against the Marlins. He also hit two batters.